This video shows how the fiber cables are made. The transmission of data on phone or internet is made by fibers. They start with glass tubes and then they submerge them into hydrophloric acid that removes any oil residuce. They set a tube in each end. As the tubes spin they are heated with H-O flames. When glass turns into white it is close to pick temperature. At 200C they fuses together. They put another tube to machine and as it spins they inject some chemical gases inside. This gas is liquid silicon, chemicals in nature, germanium which is used as a semiconductor. As gases are heated they under grow chemical reactions and white sudes occur inside of the tube. When there is enough sude they turn up the heat until itself turns to glass. Optical fiber structure is achieved. They exsize the preform from the uncollapsed part of tube. They install it to the drying tower for its final shape. Oven heats 2000C. The glass softens. With gravity it drops like honey. They strech it until it becomes thin fiber. Monitor chechs precisely the diameter of the fiber. Fiber rolled onto a drum then it is put into a cable. Fiber optic cables expensive to produce but there is copper cables which carry more info and few repeaters for keeping signal from deteoriating. Unlike copper they are immune to electromagnetic interference. The interesting part about this video is the softening and droping of glass.
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